Digital measurement and clinical significance of imaging parameters of occipital-C2 angle and posterior occipitocervical angle

QU Xing-Yue; ZHANG Shao-Jie; WANG Xing

doi:10.16098/j.issn.0529-1356.2021.01.015

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Acta Anatomica Sinica ›› 2021, Vol. 52 ›› Issue (1) : 98-102. DOI: 10.16098/j.issn.0529-1356.2021.01.015

Anatomy

Digital measurement and clinical significance of imaging parameters of occipital-C2 angle and posterior occipitocervical angle

QU Xing-yue¹ BU Jia-qi² SHI Jun³ DUAN Jin-dong² ZHOU Wen-hui² LI Zhi-jun⁴ WANG Xing^4* ZHANG Shao-jie^4*

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Abstract

Objective To explore the differences and correlation of imaging parameters of occipital-C2 angle (OC2A) and posterior occipitocervical angle (POCA) between sex and age, so as to provide theoretical reference for fixing the position of head and neck in occipitocervical fusion. Methods The imaging data of 473 cases (339 males and 134 females) were collected and divided into 2 groups according to sex. Each group was subdivided into 6 groups according to age: ≤29 year-old, 30-39 year-old, 40-49 year-old, 50-59 year-old, 60-69 year-old and ≥70 year-old. OC2A and POCA were measured in Mimics software, and their differences with sex and age were statistically analyzed. Results There was no significant difference in OC2A and POCA between sexes (P>0.05). In the OC2A male group, except for the male group aged 30-39 year-old and ≤29 year-old, there were significant differences among the other groups (P<0.05), but there was no significant difference among all age groups in the female group (P>0.05); There were significant differences in POCA between the male group of 30-39 year-old and ≤29 year-old (P<0.05), but between the group of 40-49 year-old and each group (P<0.05). In the female group, there was significant difference between the group of ≤29 year-old and all age groups(P<0.05), but there was no significant difference among the other groups (P>0.05). Pearson correlation analysis showed that there was a positive correlation between OC2A and POCA (r=0.038, P>0.05), that is, there was no correlation between them. ConclusionThere is no difference in OC2A and POCA values between sexes; there are differences in OC2A and POCA values in males among different age groups, suggesting that clinical attention should be paid to the age differences in males, while there is no difference in OC2A values in females, but POCA is different in different age groups. The changes of OC2A and POCA values in different age groups and sex provide a parameter basis for fixing the anatomical reduction angle of head and neck in occipitocervical fusion.

Key words

Occipital-C2 angle / Posterior occipitocervical angle / Imaging parameter / Occipitocervical fusion / Digital measurement / Computed tomography / Adult

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QU Xing-yue BU Jia-qi SHI Jun DUAN Jin-dong ZHOU Wen-hui LI Zhi-jun WANG Xing ZHANG Shao-jie. Digital measurement and clinical significance of imaging parameters of occipital-C2 angle and posterior occipitocervical angle[J]. Acta Anatomica Sinica. 2021, 52(1): 98-102 https://doi.org/10.16098/j.issn.0529-1356.2021.01.015

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